Looper mechanism for sewing-machines.



D. S SEYMOUR.

Patented July 11, 1916.

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n: uanms PETERS 0a.. Puma-ma. WASNINGTDN. uv c.

D. S. SEYMOUR. LOOFER MECHANISM FOR SEWING MACHINES.

APPLICATION FILED NOV. 10, I910.

Patented July 11, 1916.

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4 SHE n. s. SEYMOUR.

LOOPER MECHANISM FOR SEWING MACHINES. APPLICATlON FILED NOV-10,1910- 1,1 90,959, Patented July 11, 1916;

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Flume Moe Moms D. S. SEYMOUR. LOOPER MECHANISM FOR SEWING MACHINES.

APPIJCATION FILED NOV. I0. I910. 1,1 90,959, Patented July 11, 1916.

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s can Puomurua. WASHINGTON. n. c.

i To all whom it may concern.-

DUDLEY S. SEYMOUR, 01? OAK PARK,

COMPANY, OF CHICAGO, ILLINOIS,

ILLINOIS, ASSIGNOR TO UNION SPECIAL MACHINE A CORPORATION OF ILLINOIS.

LOOPER MECHANISM FOR SEWING-MACHINES.

Specification of Letters Patent.

Patented July ii, 1916.

Application filed November 10, 1910. Serial No. 591,735.

Be it known that I, DUDLEY S. SEYMOUR, a citizen of the United States,residing at Oak Park, in the county of Cook, State of Illinois, haveinvented certain new and useful Improvements in Looper Mechanism forSewing-Machines, of which the following is a description, referencebeing had to the accompanying drawing and to the letters and figures ofreference marked thereon.

The invention relates to new and useful improvements in sewing machines,and more especially a sewing machine of the chainstitch type, whereinboth the needle and the looper are thread-carrying elements.

An object of the invention is to provide mechanism for operating thelooper, where-' by said looper may be driven at a very high speed,without the skipping of stitches, or the breaking of the needle thread.

In driving a looper at high speed, it is very essential that the pointof the looper shall move very close to the needle as it enters theneedle loop, and at the same time avoid striking the needle. It is alsovery essential that the needle in passing the looper shall move veryclose to the looper, in order to pass between the thread of the looperand the body thereof. I have found that by swinging the looper aboutsubstantially a vertical axis when said looper is entering the needleloop, and also by swinging the looper about substantially a horizontalaxis to give the same a needle-avoiding movement, I am able to secure toa great degree the movements essential to a high speed machine.

A further object of the invention consists in providing mechanism foroperating the feed dog directly from the looper support by a connectionwhich is also located directly underneath-the feed dog. I

These and other objects will in part be obvious, and will in part behereinafter more fully described.

In the drawings, Figure'l is a view partly in plan and partly insection, showing the mechanism for operating the looper and feed; Fig. 2is a view partly in section and artly in end elevation, showing thelooper and the feed, and also the needle and presser foot; Fig. 3 is afront elevation with certain parts of the machine removed, showing themechanism for operating the" needle and looper; Fig. 4 1s a perspectiveview of the looper support; Fig. 5 is a view showing more or lessdiagrammatically the po-- sition of 'the'needle and looper in sideelevation and in plan, when the point of the looper is entering theneedle loop; Fig. 6 is a similar view, showing the looper at the forwardend of its strokeyand Fig. 7 is a similar view, showing the looper movedlaterally to avoid the needle; Fig. -8 is a detail showing theconnection between the end of the feed bar and the looper support.

In the present embodiment of my invention, I have shown a sewing machineconsisting of a bed plate 1, an overhanging arm 2, carrying at itsforward end a needle head 3, in which reciprocates a needle bar 4,carrying a needle 5. The needle bar is reciprocated by a needle lever 6pivoted at 7 to the overhanging arm, and connected by a link 8 to asuitable eccentric on the main shaft of the machine. The presser foot 9is carried by the presser bar 10, which is raised and lowered by a lever11. These parts are of the usual construction, and form no part of mypresent invention. The feed dog 12 is carried by a feed bar 13, which ispivoted at its rear end to a feed rocker 14. Said feed rocker isoscillated by a link ing lever 16 actuated by an eccentric on the mainshaft. The looper 17 is detachably mounted in a looper carrier 18, whichis pivotedto swing about a substantially vertical axis. Said looper ispreferably formed on the arc of a circle, the center of which issubstantially coincident with the center of oscillation of said loopercarrier. The looper carrier is mounted on a looper support 19. Saidlooper support as herein shown, consists of spaced sleeves 20 and 21.The sleeve 21 is connected to a short stud mounted in a bearing 22formed in a standard projecting from the bed plate. The sleeve 20 issecured to a short shaft extending through 'a bearing 23, and carryingat its other end an arm 24, which in turn is pivotally connectedwith therocking lever 16. This rocking lever is similar in construction to therocking lever of the Seymolli" Patent No. 1,124,667, granted January 15,connected to a rock-I .is provided with 12th, 1915. Projecting laterallyfrom the looper support and at apoint intermediate the sleeves 20 and 21is an arm 25, which a bearing for the looper carrier 18. The loopercarrier 18 at its lower end is provided with a. laterallyprojecting arm26, carrying a ball stud. 27, to which one end The other end of to aballstud 29 carried by a rock shaft 30. The rock shaft 30..is inturnconnected by a link 31, to the needle lever extension 32. These partsare so positioned that when thelooper is at the forward'en'd of itsstroke, the needle lever extension 32'and the link 31 are substantiallyin line, which gives adwell to the stroke of the looper atthis time.

The feed bar 13 is raised means of a link 33, which is connected at itsupper end to the lower part'of the laterally projecting arm 25, whichsupports the looper carrier. The link 33 at its lower end is connectedto a downwardly projecting arm 34, whichis formed'asa part of the feedbar and looper support: The arm 34 is-located'directly' underneath'thefeed bar 13,.and .the forward end of the arm is substantially.underneath the forward end-of the feed'bar.

The link 33 is substantially a vertical link,

and, there-fore, the lifting force exerted by the looper support isdirectly underneath the forward end of thefeeddog. This con struction,whereby theliftof the feed dog is brought about by a connection directlyunderneath the same, prevents all chances. of tilting of the feed doglaterally and'brings the strain directly whereby a very efficient feedactionis secured.

In the operation ofmymachine, the looper carrier 18 swings about itsaxis, through the action of the connected link 28, and causes the looperto move into and out of the. needle loop. The looper support rocks aboutits axis through the action of the rock lever 16, and causes the looperto move bodily across the needle path, soth'at the looper will moveforward into the needle loop on one sideof the needleacross the needlepath, needle loop on the other side. of theneedle path. When the looperis" entering the needle loop, the supporting arm25 is'inclined slightlyfrom the horizontal, as

shown inFig. 5, and consequently the axis of the looper carrier isslightly inclined at this time to the vertical. I am able, therefore, toset the needle and the looper, so that the point of the looper'willpassvery close to the needle-as it enters the needle loop, for the reasonthat asthe looper moves forward into the'needle loop,nthe-arm 25 isrocked so as to raise the. same: slightly of a link 28 is connected.

the link 28 is connected forward end of its stroke.

and lowered by extends underneath the underneaththe feed dog,

and be retracted from the through the action of the rock lever 16, andthis-gives suflici'ent room forthe body of the looper to pass by theneedle to the position shown in Fig. 6. I further secure theclearancebetween the needle and the looper by curving the body ofthelooper, as clearly shown in Fig. 1. When the looper reaches theforward end ofits stroke, the arm 25 is substantially horizontal, asshown in Fig. 6. At this time, the link 31 is substantially in linewiththeneedle lever extension 32, and the looper is given an extended dwellat the During this dwell, however, tlielooper is moved laterally, soasto .be properly positioned for the passing ofthe needle between the bodyof the looper and the looper thread. During this-lateral swing. of thelooper, thearm 25 moves to the-position shown in Fig. 7 thuscarryingthe.looper to the opposite side of the needle path, as clearlyshown in this figure. IVhenthe looper is positioned as shown in Fig. .7,theface of the looper adjacentx'the needle is inclined to the verticalwith theupper edge of the looper at some distance from the needle path,.and with the lower edge of the looper very close to the needle path.This inclined face of the looper allows the setting of the needle veryclose to the looper, for the reason that if the needle-should beslightly sprung and should strike the inclined face of the looper, itwill he. quickly brought back to its proper path andpass the looperwithout breaking the needle. I am thereby able to cause the needle topass very close to the looper, and said needle will pass between thelooper body and looper thread with certainty, thus causing the properinterlocking of the thread. i

It will be noted that-as the looper swings to the opposite side of theneedle path to a position for the needle to pass between the looperthread and the body of the looper, that said looper moves downward andaway from the cloth plate. The needle loop is at this time upon thelooper and this movement of the looper will aid in the'drawing of theprevious stitches tight.

It will be noted that the feed dog is moved back and forth and is alsoraised and lowered and the looper is given a needle avoiding movementall by the single eccen trio which operates the rock lever 16. It willalso benoted that the looper support 19 has acut-away portion betweenthe sleeves 20 and 21, which allows the needle to move to the lower endof its'stroke without striking the looper support.

Having thus described my invention, what I.- claim as new and-desire tosecure by Letters-Patent, is

1.- A sewing machine including in combination, ,a work support, aneedle, a looper cooperating with said needle wholly be neath the worksupport, means for carrying said looper whereby it swings about asubstantially vertical axis when moving into and out of the needle loop,and means for moving said looper carrying means about a horizontal axisfor swinging the looper bodily from one side of the needle to the otherfor its needle avoiding movement.

2. A sewing machine including in combination, a Work support, a needle,a looper cooperating with said needle wholly beneath the work support, alooper carrier, means for supporting said carrier, whereby the samemoves about a substantially vertical axis, a looper support on whichsaid carrier is mounted, and means for oscillating said support about ahorizontal axis for movingthe looper from one side of the needle to theother for its needle avoiding movement.

3. A sewing machine including in combination, a needle, a loopercooperating with the needle wholly beneath the work support, a loopercarrier mounted to swing about a substantially vertical axis, a linkconnected to said looper carrier for oscillating the same, a loopersupport, an arm carried by said looper support and having a bearing forsaid looper carrier, said looper support being mounted to swing upon asubstantially horizontal axis, and means for oscillating said loopersupport for carrying the looper from one side of the needle to the otherfor its needle avoiding movement.

4. A sewing machine including in combination, a needle, a needle leverhaving an extension, a looper, a looper carrier mounted to swing about asubstantially vertical axis, a link connected to said looper carrier, arock lever connected to said link, a second link for connecting saidrock lever to the needle lever extension, said link and needle leverextension being so disposed as to give an extended dwell to the looperat the for-- ward end of its stroke, a looper support, means foroscillating said looper support about a substantially horizontal axis,said Copies of this patent may be obtained for five cents each, byaddressing the looper support having an arm on which said looper carrieris mounted.

5. A sewing machine including in combination, a Work support, a needle,a looper coiiperating with said needle wholly beneath the work support,a looper carrier, means for supporting said looper carrier whereby thesame moves about a substantially vertical axis, and means for movingsaid supporting means for tilting the axis of the looper carrierrelative to the path of the needle for moving the looper to the op-.posite side of the needle for its needle avoiding movement.

6. A sewing machine including in combination, a work support, a needle,a looper cotiperating with the needle beneath the work support, a loopercarrier, means for oscillating said looper carrier about a substantiallyvertical axis, a looper carrier support, an arm projecting laterallyfrom said support and pivotally supporting said carrier, said arm beingsubstantially horizontal when said looper is moving into and out of theneedle loop, and means for oscillating said looper support for movingsaid arm to an inclined position for carrying the looper to the oppositeside of the needle for its needle avoiding movement.

7 In a sewing machine, the combination of a feed dog, a needle, alooper, a support pivoted to swing about a horizontal axis, said supporthaving a laterally projecting arm swinging in a vertical plane, a loopercarrier mounted on said arm and swinging in substantially a horizontalplane, means for swinging the looper carrier, said looper support havinga connection to the feed dog located on one side of the axis of saidsuport.

In testimony whereof I. affix my signature, in presence of twowitnesses.

DUDLEY .S. SEYMOUR.

Witnesses:

G. MoNnrn, A. B. GLOTHIER.

Commissioner of Patents,

Washington, D. G.

